Backing for temporary signs



FIG. 1 is a bottom perspective view of a backing for temporary signs showing my new design;

FIG. 2 is a right side elevational view thereof with the left side being a mirror image;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is an end elevational view thereof; and,

FIG. 6 is an opposite end elevational view thereof.

The broken lines are shown for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a backing for temporary signs, as shown and described. 